Specifications

19 PowerEdge M620 Technical Guide

 DIMMs must be installed in each channel, starting with the DIMM farthest from the processor.

 DIMMs should be installed with largest rank count to smallest. For example, if DR DIMMS are

mixed with SR DIMMs, DR DIMMS should be placed in the lowest DIMM slots, followed by the SR

DIMMs.

For more information on memory configuration and population, see the

Dell PowerEdge M620

Systems Owner’s Manual

on Dell.com/Support/Manuals.

Memory speed

The M620 supports memory speeds of 1866MT/s, 1600MT/s, 1333MT/s, 1066MT/s and 800MT/s

depending on the DIMM types installed and the configuration. All memory on all processors and

channels run at the same speed and voltage. By default, the system runs at the highest speed for the

channel with the lowest DIMM voltage and speed. The operating speed of the memory is also

determined by the maximum speed supported by the processor, the speed settings in the BIOS and

the operating voltage of the system.

Table 8 lists the memory configuration and performance details for the M620, based on the

population of the number and type of DIMMs per memory channel.

Table 8. Memory speed capabilities

DIMM

type

DIMM

Number

of DIMMs

Speed (MT/s)

800*

1066*

1333

1600

1866

UDIMM

∞

RDIMM

∞